Method of and arrangement for winding the starting end yarn on to pirns in automatic weft pirn winding machines



Jan. 6, 1959 K. MARX ET AL 2,867,388

METHOD OF AND ARRANGEMENT FOR WINDING THE STARTING END YARN ON TO PIRNS IN AUTOMATIC WEFT PIRN WINDING MACHINES Filed April 5, 1955 4 Sheets-Sheet 1 I7 I r A 9 7 n V W INVENTORS: KARL MARX BY WWW i? Jan. 6, 1959 K. MARX ET AL 2,867,388

METHOD OF AND ARRANGEMENT FOR WINDING THE STARTING END YARN ON TO PIRNS IN AUTOMATIC WEF'T PIRN WINDING MACHINES 4 Sheets-Sheet 2 Filed April 5, 1955 INVENTORS:

Jan. 6, 1959 K. MARX ET AL 2,867,388

METHOD OF AND ARRANGEMENT FOR WINDING THE STARTING END YARN ON To PIRNS IN AUTOMATIC wEET PIRN WINDING MACHINES Filed April 5, 1955 4 Sheets-Sheet s INVENTORS: K A a; NAB x y MAX STAUB-L/ w Tw g 1 K. MARX ET AL ,867,388

METHQD OF AND ARRANGEMENT FOR WINDING THE STARTING END YARN ON TO PIRNS IN AUTOMATIC WEFT PIRN WINDING MACHINES Filed April 5, 1955 4 Sheets-Sheet 4 69a 69 e1 76 61a m 655 74 v ig I7 i ;8e:f5:756

on the ejection of the pirn; t

METHOD OF AND ARRANGEMENT FOR WIND- ING THE STARTING END YARN ON TO PIRNS IN AUTOMATIC WEFT PIRN WINDING MA- CHINES Karl Marx and Max Stiiuhli, Horgen, Switzerland, as-

signors to Maschinenfabrik Schweiter A. G., Horgen, Switzerland, a Swiss company Application April 5, 1955, Serial No. 499,486

Claims priority, application Switzerland April 8, 1954 Claims. (Cl. 242-27) The present invention relates to a method of and means for winding yarn or like strand material onto bobbins or pirns in automatic weft pirn winding machines.

In most known weft pirn winders the yarn is clamped between the head of the newly supplied empty pirn and the driver of the winding machine so as to transfer the thread being wound from the full to the empty pirn while the pirn is changed. The fully wound ejected pirn has a relatively long thread end which, when weaved off in the shuttle, hinders the run of the yarn and may cause faults in the fabric. The present invention aims at eliminating this thread end.

Devices for severing this thread end are known in which the thread end is automatically severed by means of an exchangeable razor blade or a rotating knife disk. These devices, however, have the disadvantage that they require a relatively great amount of attendance and that the changing of the cutting knife is a time-wasting job which is not without danger.

The method according to the present invention is carried out by the yarn still engaged by the yarn guide and still connected to the ejected pirn being gripped by a rotating catch hook in such manner as to form a loop which is wound onto the empty pirn, the yarn thereafter being broken off between the finished pirn and the empty pirn and then the yarn is wound in the pirn package of the empty pirn.

The method is carried out with the aid of an arrangement including a friction-driven catch hook that rotates during the start of winding and which is brought into range of the yarn by means of a lateral movement parallel to the spindle axis.

Several embodiments of the device according to the invention are illustrated in the attached drawing in which:

Fig. 1 shows the pirn driver, an empty pirn clamped in position and an ejected full pirn at the moment of the pirn change, the yarn hook and winding drivearrangement being shown in cross-section;

Fig. 2 shows the arrangement according to Fig. 1 at the moment when the catch hook winds the yarn through its loop formation, in two threads on to the empty pirn;

Fig. 3 is a diagrammatic view of the catch hook shown on an enlarged scale;

Fig. 4 is a cross-section of another form of catch hook;

Figs. 5 to 9 are diagrammatic views of the catch hook v in various positions;

Fig. 10 shows the collector in the case of a pirn which drops in the upright position;

Fig. 11 shows a pirn clamp of a weft pirn ejected in upright position; I

Fig. 12 shows the arrangement according to Fig. 1 in conjunction with a collector for the finished pirn and a device for clamping the pirn when the yarn is brokenoff I 2,857,388 Patented Jan. 6, 9

Fig. 13 shows the arrangement according to Fig. 12 at the moment when the yarn is broken off;

Fig. 14 is a view of means designed to swing out the yarn guide during the pirn change;

Fig. 15 is a top plan view of Fig. 14;

Figs. 16 to 25 illustrate various successive positions of an alternative embodiment with catch hook made according to the invention;

Fig. 16 shows the arrangement after the pirn has been wound; I

Fig. 17 shows the arrangement at the moment when an empty pirn is brought into the clamping position;

Fig. 18 shows the emptypirn clamped in position;

Fig. 19 shows the catch hook in its catching position;

Fig. 20 shows the catch hook in the position in which it has released the loop;

Fig. 21 shows the path of the empty pirn clamped in position and the thread between the dropped pirn and the thread guide;

Fig. 22 shows in cross-section the empty pirn clamped in position;

Fig. 23 shows the catch hook at the moment when it has gripped the thread;

Fig. 24 shows the catch hook after releasing the loop;

Fig. 25 is a section taken along line 2525 of Fig. 23.

. Referring now more specifically to the drawings, there is disclosed a still empty pirn 2 clamped between the pirn driver 1 and a counter stop. Mounted so that it is axially displaceable in the bearings 4 and 5 in the housing of the winder is a rod 3 which is caused to reciprocate by a' cam disk 6 via the roller 7, the lever 8, the guide rod 9 and the set collar 11 which is provided with a bolt 15). Secured to the front end of the rod 3 by means of the screw 14 is a housing 13. Arranged in the housing 13 is a ball-bearing outer race 15 and a rotatable ball-bearing inner race 16 which has a gear rim 17. The gear rim 17 is engaged by a gear wheel 18 arranged on the spindle 19 which is driven by the friction wheel 2% when the latter comes into contact'with the pirn driver head 1.

In the present embodiment according to Figs. 1 to 10 the transmission ratio is such that the ball-bearing inner race 16 runs more slowly than, but in the same direction of rotation as, the pirn driver head 1. Secured to the ball-bearing inner race 16 is a catch hook 22 which is illustrated in Fig. 3 and will be described in detail hereinafter.

Fig. 1 illustrates a position of the various parts of an embodiment of the invention in which the pirn 2 is completely empty and the yarn F is still stretched between the yarn guide 23. and the full pirn S which has been ejected into the collecting box 24.

Fig.- 5 further illustrates this position. The yarn F lies on the empty pirn 2 and forms an angle 8 with the radial line '25. The catching slit 22a of the catch hook also forms an angle [5 with the radial line and is so shaped and constructed that the said slit is brought parallel to theryarn section F whereby the yarn catches and engages the slit. The yarn is now carried along by the hook 22, as can be seen from Fig. 6. After half a revolution (Fig. 7) a loop F has already formed so that at the same time the yarn section F leading to the full and ejected pirn S and the yarn section F leading from the yarn guide23 to the empty pirn 2 are wound round the empty pirn. After the first revolution of the catch hook22 the yarn section F is no longer on the left side of the pirn, but on the right side. The angle of the catch hook no longer corresponds to the position of the yarn section F so that the catch hook due to its particular shape slides away under the yarn section F without being able to take the latter with ita result which is also aided by the facets of the corners 22b and pirn diameter.

3 22c defining slit 22a. As the rotational speed of the empty pirn is greater than that of the catch hook (seated on inner race 16), an advance results by means of .which the thread. loop F slidout of .the. catch hook.

Since, however,- thecatch hook performs a lateral .movement parallel, to thespindleaxis, the thread loop-F is released in any eventfrom- .the. catch hook. The. yarn is now sufiiciently thickly-woundon the pirn 2 and is therefore carriedalong at the full peripheral speed of the T he yarnv strand- F would now have to be wound off from the finished or fullpirn S at the same speed. As, however, the said pirn,.owing to its friction in the collecting hopper 24, can no longer rotate so fast, the yarn breaks off, as can be seen from Fig. 9, and hoth the broken oif section F and the loop F are completely woundin the yarn package to be formed so that neither of. them is visible on. the hereafter finished and wound pirn. If the yarn has a relatively high breaking; strength, it will be necessary to hold the ejected pirn firmly. when the yarn is broken off, as is shown in Figs. 11: to 13.

In Fig.4 the catch hook is formed of two parts,.3t and 31, part 31 being elastic so that the yarn can be clamped beneath ituntil it is pulled out as a result ,of the advance.

Figs. and 11 illustrate the same device as Figs. 1 to 9, but with the difference that the pirn-2 drops into an upright roller container. The pirn ishere held by means of the cock spring 33, swivellably mounted on the bolt 35, while the yarn is broken oif. To this end the pin 34 on the housing 13 presses against the spring arm 33a, whereby the spring arm 33b is forced against the pirn :Fig 12 shows the finished pirn S, which has dropped 'from the pirn driver 1 and the counter stop 40, with its front part in the hopper 41 and with its piston 2a resting on the plate 42. The housing 13a with the race 16 and the catchhook 22 which, as in Fig. 1, are secured to the rod 3, are shown in withdrawn position. The housing 13a has an arm 13b in which the threaded bolt 44 is screwed and tightened by means of the lock nut 45. The front end of the bolt 44 has no thread, it is rounded and corresponds in diameter to the bore 2b of the pirn tube 2. Rotatably arranged on the threaded bolt 44 and designed as a threaded nut is the bush 46. which has on its front end a driving disk 47 made of rubber or similar material. Mounted on the bush 46 is a torsion spring 48, one end of which is connected to the bush 46 and the other to the arm 13b. The torsion spring 48 is so coiled that it tends to tighten the bush 46 on the threaded bolt 44 in the direction 'of the arm 13!]. Whenthe full pirn S has been ejected and an empty pirn tube 2 is clamped between the driver 1 and the counter stop 40, the housing 13a, as described in conjunction with Fig. 1, moves to the left so as to grip the yarn F with the catch hook '22 and to bring it up to the pirn tube 2. At the same :time the threaded bolt 44 penetrates the bore 2b of the pirn tube and, by means of the driving disk 47, presses the pirn S point first into the hopper 41. During this :movement, thepirn is raised from the plate 42, but it can still rotate.

When the yarn end F is pulled off the pirn S, the latter rotates and causes, via the driving disk 47, the bush 46 to screw to the left on the threaded bolt 44 and to clamp'the pirn S so tightly that the yarn end feeler roller and the thread feeler secured to the same holding member must be capable of being removed from their position during winding. To this end the yarn feeler roller 50 and the yarn guide 51 are, as can be seen "from Figs. 14 and 15,. secured to a swivel arm 52 which is mounted by means of the bolt 53 on the yarn guide 4 slide 54 which moves along the shaft '55 and the rpd 56. The bolt 53' is provided with a twisted tongue 57. Two bolts 58 are secured to the housing arm 13c. At the pirn change the thread guide slide is in its rearmost position as shown in Fig. 15. When the housing 13 is displaced to eifect the pirn change, its bolts 58 .engage overthe tongue '57, whereby the yarn feeler roller 50 and the yarn guide 51 are swivelled out of their position during winding into the position marked in dotted lines (Fig; 14).

The following alternative arrangement differs from the one described in that the catch hook is directly coupled to the driving spindle by axial displacement and is brought into the range of the thread still stretched between the thread guide and the ejected full pirn, which catch grips the thread and, forming a loop, Winds it round the empty pirn, whereupon the loop is released by the withdrawal of the catch hook and the latter is decoupled from the driving spindle. The alternative embodiment is therefore characterized by the fact that the driving spindle and the catch hook axially displaceable in respect of the latter have coupling means which, when the catch hook is displaced, are positively connected for the purpose of driving the catch hook directly by means of the driving spindle.

This alternative method and the appurtenant arrangement will now be described in detail in conjunction with Figs. .16 to 25.

The driving spindle 63 is mounted by means of a ball bearing 62 in the housing 61 of a winding machine, not described in detail, which housing has a guide bush 61a. Arranged on the driving spindle 63 isthe bush 64 which has a gear rim 65 with which the drive wheel 66 of the spindle 67 engages. iThe bush 64 has a collar.68 in which a holder 69 engages which is arranged on thedisplaceable rod 69a. The driving spindle'63 is horizontally displaceable by means of the rod 6% and the holder 69, the ball-bearing 62 being shifted in the guide bush 61a. The pirn 79 is mounted at one endin the countersupport 72 and at the other in the driver head 63a. iffhe counter support 72 is mounted in theball-bearin'g74 and can rotate freely. A bush 76, concentric to the guide bush 61a and provided With'thfi catchhook 76a. isrotatably mounted by means' of bearing balls "77 injthe sliding bush 78. The latter has a shoulder 78a with which it is connected to the rod 79 mounted in thehous: ing 61 so that it is horizontally displaceable. Theibush 76 has an inward facing head or flange 76b which serves as coupling member and, by acting together with the'rubber ring 63b arranged on the driver 63a, is coupled' ata given moment with thesaid driver (Fig. 19), whereupon the catch hook 76a-is rotated at the same speed as the driver 63a. The bush 78 covers the catch hook'76a but has a notch 78d, the depth of which corresponds to the height of the catch hook 76a (see Fig. 25).

The various steps of the novel method are illustrated in Figs. 17 to 24.

In Fig. 17 the driver 63a is held in a withdrawn position by the rod 69a. An empty pirn 70a is introduced in known manner with the aid of a lever 73 (-Fig. 21) between the counter support 72 (Fig. 16) and the driver head 63a. The thread F of the dropped pirn 70to the yarn guide is still taut and is laid against the newly inserted empty pirn 70a, as can be seen from Fig. 21.

As shown in Fig. 18, the empty pirn 70a-is already clamped in head 63a in operative position. The thread, however, is still in the position shown in Fig. 17.

in Fig. 19 the bush 78 has been displaced so far to the right that the still taut thread F is laid in the groove'78d and therefore comes into the range of the driving or catch hook 76a. Opposite the groove-78d the edge 78b of the bush 78 projects so far forward that the lower section lof the thread cannot be gripped by the catch hook 76a (Fig. 25 In this position of the bushes 78 and 76 the flange or head 76b is in frictional engagement with the rubber ring 63b so that the catch hook 76a rotates at the same speed as the driver head 63a. The catch hook 76a therefore grips the thread F which is in the groove 78a and carries it along with it. A loop is thus formed which winds round the empty shaft of the pirn 70a, the dropped pirn being easily raised and rota-ting so as to release sufficient thread for the formation of the loop. This movement of the pirn is limited by a stop, the thread breaking when the stop is reached. To prevent the catch hook 76a gripping the thread section F again and again during the second and subsequent revolutions and thus forming further loops, the groove 78d (Fig. 25) is so bevelled that the thread section P, which now runs on to the right side of the pirn shaft 70a and bears on the edge 7% at P (Fig. 25) can no longer be gripped by the catch hook 76a. The catch hook 76a and the bevelled surface 782 are so adjusted to one another that the latter does not pull the thread P out of the catch hook. As soon as sufficient thread has been wound on to pirn sh-aft 70a, the bush 78 with the bush 76 is withdrawn to its starting position (Fig. 16) by the rod 79. The loop is thus released from the catch hook 76a and the rotation of the bush 76 is interrupted because the head 76b ceases to be in contact with the rubber ring 63b. As winding continues, both the loop and the now broken end F (Fig. 24) are wound on to the pirn.

Various changes and modifications may be made without departing from the spirit and scope of the present invention and it is intended that such obvious changes and modifications be embraced by the annexed claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. The method of transferring yarn to an empty rotating pirn for starting the winding operation for the empty pirn while the yarn extends with one portion between a yarn guide and a full pirn rotatable in its ejected position; comprising the steps of deviating said yarn portion from one side of the diameter of said empty pirn to thereby form a loop from said yarn portion at the opposite side of said empty pirn, carrying the loop about the empty pirn for entraining said loop about said empty pirn with said loop moving around said empty pirn at full peripheral speed of said empty pirn, and finally rotating said empty pirn at a rate of speed greater than that of said full pirn to thereby rip said yarn adjacent said full pirn, thus presenting a yarn end, which together with said loop is completely Wound in the yarn package to be formed on said empty pirn.

2. A device for winding yarn and like strand material onto an empty pirn in a winding machine, in which a portion of said yarn extends from a yarn guide to a full pirn; comprising a first rotatable and displaceable element for drivingly engaging said empty pirn to impart to same a predetermined rotational speed, a second rotatable element provided with a catch hook and arranged for coaxial displacement to said first rotatable element, respective means on said elements coupling said elements with each other upon relative axial displacement of one element to the other, and means intermittently displacing said elements relative to each other, whereby said catch hook is moved toward said yarn guide and within the range of said yarn portion, said catch hook being shaped and constructed, so that it first entrains said yarn portion from one side of the diameter of said empty pirn for transfer to the opposite side of said empty pirn and then releases a yarn loop formed thereby, said rotatable elements upon engagement of said coupling means rotating together, said predetermined rotational speed being greater than that at which said full pirn is capable to rotate, thereby causing breakage of yarn extending beyond said full pirn and subsequent winding of the thereby broken yarn end together with said loop in the yarn package to be formed on said rotating empty pirn.

3. A device according to claim 2, said second rotatable element being in the form of a bush concentrically arranged to said first rotatable element, said catch hook being carried within said bush.

4. A device according to claim 3, said bush being provided in its front end face with a groove, the depth of said groove corresponding to the distance of said catch hook from said front end face.

5. A device according to claim 2, wherein said respective coupling means of said elements are formed by a rubber ring disposed on the surface of said first element and by a flange provided at the rear end face of said bush.

References Cited in the file of this patent UNITED STATES PATENTS 2,614,771 Goodhue Oct. 21, 1952 2,692,089 Siegenthaler Oct. 19, 1954 FOREIGN PATENTS 505,947 Great Britain May 19, 1939 

